No power to fuel pump
Which engine? 2.5 or 4L ,,, always engine first...... ill post for 4liter.
the first test on all EFI, (varies rules) but here it is.
many cars only have power to the pump cranking and running (ONLY)
(crash and burn rules... dig it?)
so use the meter this time and crank.
fuses first check.
btw, alldata.com has that, login and look, like us.
see schem linked here. its real simple and is online. (goggle)
this EFI pump in 1993, is 100% controlled by the ECU. at all times
Fuse 1, blown kills pump dead.
software (firm) in the ECU controls this.
http://www.fixkick.com/look/odds-ends/jeep/93wrangler-EFI-4L.jpg
if cranking , pump is dead, check coil for 12v, on fuel pump relay
if not 12v across coil, cranking the ECU is bad.
or ECU detects spark loss, again, crash and burn logic in the ECU.
the ecu monitors spark at all times. if bad it cuts fuel
even if spark is GOOD. ! and spark feed back is bad.
that is pin 44 on ECU is dead......... for any reasons.....
Testimonial: "2.5L eng no power to fuel pump does ecu have fuses and where is it located I have know manuels can I use jump wire from another relay at battery to run pump was rewiring brakes to have brake lights when problem occurred checked all connections they are good fuses are good infuse panel and at the relays"
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